Merge from trunk revision 104c05c5284b7822d770ee51a7d91946c7e56d50.

1 files changed, 93 insertions, 0 deletions

diff --git a/gcc/gimple-range-path.h b/gcc/gimple-range-path.h
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+/* Header file for jump threading path solver.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   Contributed by Aldy Hernandez <aldyh@redhat.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_TREE_SSA_THREADSOLVER_H
+#define GCC_TREE_SSA_THREADSOLVER_H
+
+// This class is a basic block path solver.  Given a set of BBs
+// indicating a path through the CFG, range_of_expr and range_of_stmt
+// will calculate the range of an SSA or STMT as if the BBs in the
+// path would have been executed in order.
+//
+// Only SSA names passed in IMPORTS are precomputed, and can be
+// queried.
+//
+// Note that the blocks are in reverse order, thus the exit block is
+// path[0].
+
+class path_range_query : public range_query
+{
+public:
+  path_range_query (class gimple_ranger &ranger);
+  virtual ~path_range_query ();
+  void precompute_ranges (const vec<basic_block> &path,
+			  const bitmap_head *imports);
+  bool range_of_expr (irange &r, tree name, gimple * = NULL) override;
+  bool range_of_stmt (irange &r, gimple *, tree name = NULL) override;
+  bool unreachable_path_p ();
+  void dump (FILE *) override;
+  void debug ();
+
+private:
+  bool internal_range_of_expr (irange &r, tree name, gimple *);
+
+  // Cache manipulation.
+  void set_cache (const irange &r, tree name);
+  bool get_cache (irange &r, tree name);
+  void clear_cache (tree name);
+
+  // Methods to precompute ranges for the given path.
+  bool range_defined_in_block (irange &, tree name, basic_block bb);
+  void precompute_ranges_in_block (basic_block bb);
+  void adjust_for_non_null_uses (basic_block bb);
+  void ssa_range_in_phi (irange &r, gphi *phi);
+
+  // Path navigation.
+  void set_path (const vec<basic_block> &);
+  basic_block entry_bb () { return (*m_path)[m_path->length () - 1]; }
+  basic_block exit_bb ()  { return (*m_path)[0]; }
+  basic_block curr_bb ()  { return (*m_path)[m_pos]; }
+  basic_block prev_bb ()  { return (*m_path)[m_pos + 1]; }
+  basic_block next_bb ()  { return (*m_path)[m_pos - 1]; }
+  bool at_entry ()	  { return m_pos == m_path->length () - 1; }
+  bool at_exit ()	  { return m_pos == 0; }
+  void move_next ()	  { --m_pos; }
+
+  // Range cache for SSA names.
+  ssa_global_cache *m_cache;
+
+  // Set for each SSA that has an active entry in the cache.
+  bitmap m_has_cache_entry;
+
+  // Path being analyzed.
+  const vec<basic_block> *m_path;
+
+  // Current path position.
+  unsigned m_pos;
+
+  const bitmap_head *m_imports;
+  gimple_ranger &m_ranger;
+  non_null_ref m_non_null;
+
+  // Set if there were any undefined expressions while pre-calculating path.
+  bool m_undefined_path;
+};
+
+#endif // GCC_TREE_SSA_THREADSOLVER_H